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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 89 | if ( $post_thumbnail_id ) { |
| 90 | do_action( 'begin_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size ); // for "Just In Time" filtering of all of wp_get_attachment_image()'s filters |
| 91 | if ( in_the_loop() ) |
| 92 | update_post_thumbnail_cache(); |
| 93 | $html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr ); |
| 94 | do_action( 'end_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size ); |
| 95 | } else { |
| 96 | $html = ''; |
| 97 | } |
| 98 | return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr ); |
| 99 | } |
| 100 | |